A drug abuse is a controllable risk factor of infectious diseases. Thus, option A is correct.
These type of disease are caused by organisms by either bacteria, viruses, fungi or parasites.
Some infectious diseases can be transmitted from person to person by either directly, by insects, by animals or by contaminated food or water or exposure to harsh environment.
On the basis of causative agents, various types of infectious diseases such as viral Infections, bacterial Infections, Fungal Infections, Prion Diseases.
Viruses infected diseases like the rabies virus affects the nervous system.
Some of the major symptoms include fever, swelling, heat, pain, skin rashes, memory loss, lymph gland swelling, cognitive difficulties etc.
Although Pollution, air, and heredity cannot be controlled, but Drug abuse is a controllable. Hence, option A is correct.
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